| Lucas_Werkmeister_WMDE added a comment. |
safe-regex mainly works by measuring the star height of the regex, and disabling nesting is a crude way to limit the star height to 1, so that we don’t need to parse the regex. (a*b*[ac]*$ has multiple stars, but its star height is still one.)
That said, a slightly modified version of your regex (a*a*b$) does cause long query runtimes when tested against a long string of as in WDQS. But I can’t reproduce that behavior locally with Java String.matches() nor with PHP preg_match(), so I’m not sure if that’s a problem related to the regex engine or some BlazeGraph weirdness.
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